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WO2010010742A1 - Unité d’éclairage, dispositif d’éclairage et dispositif d’affichage à cristaux liquides - Google Patents

Unité d’éclairage, dispositif d’éclairage et dispositif d’affichage à cristaux liquides Download PDF

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Publication number
WO2010010742A1
WO2010010742A1 PCT/JP2009/057266 JP2009057266W WO2010010742A1 WO 2010010742 A1 WO2010010742 A1 WO 2010010742A1 JP 2009057266 W JP2009057266 W JP 2009057266W WO 2010010742 A1 WO2010010742 A1 WO 2010010742A1
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WO
WIPO (PCT)
Prior art keywords
light
light emitting
light guide
guide
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2009/057266
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English (en)
Japanese (ja)
Inventor
哲也 上野
千幸 神徳
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Sharp Corp
Original Assignee
Sharp Corp
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Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to US13/002,769 priority Critical patent/US20110134360A1/en
Publication of WO2010010742A1 publication Critical patent/WO2010010742A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0028—Light guide, e.g. taper
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
    • G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0078—Side-by-side arrangements, e.g. for large area displays
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • the present invention relates to an illumination unit used as a backlight of a liquid crystal display device, an illumination device, and a liquid crystal display device including the illumination device.
  • liquid crystal display devices which are rapidly spreading in place of cathode ray tubes (CRT), are widely used in liquid crystal televisions, monitors, mobile phones and the like, taking advantage of their energy-saving, thin, and lightweight features.
  • improvement of an illuminating device (so-called backlight) disposed behind the liquid crystal display device can be mentioned.
  • Lighting devices are mainly classified into side light type (also called edge light type) and direct type.
  • the direct type lighting device arranges a plurality of light sources behind the liquid crystal display panel and directly irradiates the liquid crystal display panel. Therefore, it is easy to obtain high brightness even on a large screen, and it is mainly used in large liquid crystal displays of 20 inches or more.
  • the current direct type illumination device has a thickness of about 20 mm to 40 mm, which is an obstacle to further thinning the display.
  • the sidelight type has a configuration in which a light guide is provided behind the liquid crystal display panel, and a light source is provided at the lateral end of the light guide. The light emitted from the light source is reflected by the light guide and indirectly irradiates the liquid crystal display panel indirectly.
  • a light guide is provided behind the liquid crystal display panel
  • a light source is provided at the lateral end of the light guide. The light emitted from the light source is reflected by the light guide and indirectly irradiates the liquid crystal display panel indirectly.
  • sidelight type lighting devices are mainly used in small and medium liquid crystal displays such as mobile phones and notebook computers.
  • Patent Document 1 As an example of the side light type, the one described in Patent Document 1 can be cited.
  • Patent Document 1 includes a main light plate GLBM having a light emission surface for expanding and emitting light in a planar shape, and sub light guide plates GLBS and GLBS2 provided on the back side of the main light plate GLBM.
  • sub light guide plates GLBS and GLBS2 Provided on both end surfaces of the four sides of the main light guide plate GLBM and the sub light guide plates GLBS / GLBS2 are light reflecting plates REF having a substantially U-shaped cross section to be optically coupled.
  • the light from the light source provided on the back side of the sub light guide plates GLBS / GLBS2 travels between the main light plate GLBM and the sub light guide plates GLBS / GLBS2, and the four sides of the main light guide plate GLBM and the sub light guide plates GLBS / GLBS2.
  • the light reflecting plates REF provided on both end surfaces of the light, and surface light is emitted from the light emitting surface.
  • the light reflection plate REF provided on both end surfaces of the four sides of the main light plate GLBM and the sub light guide plates GLBS / GLBS2 reflects the light from the light source on the light emission surface, and thus the backlight.
  • the size is increased, uniform surface light emission cannot be obtained.
  • Patent Document 2 discloses a backlight structure in which a plurality of backlight devices are connected by a continuous coupling method. As shown in FIG. 7, the backlight structure described in Patent Document 2 includes a plurality of backlight devices 200 each having a reflective portion 220, and the reflective portion 220 of the backlight device 200 and the adjacent backlight device 200. Are arranged to overlap.
  • a wide light-emitting portion can be secured with a compact structure, and therefore, it can be suitably used for a large liquid crystal display.
  • an illuminating device configured by arranging a plurality of light emitting units configured by combining a light source and a light guide plate is called a tandem type illuminating device.
  • a light emitting diode (LED) used as a light source is damaged at the manufacturing stage, and various members arranged below the light emitting unit and the light guide are defective. When this occurs, rework processing such as replacing the light emitting unit may be performed in order to remove the generated defect.
  • LED light emitting diode
  • the reflection unit 220 of the backlight device 200 and the adjacent backlight device 200 are arranged to overlap each other. For this reason, after assembling the backlight device 200, if it is found that a defect has occurred in a certain backlight device, it is not possible to remove only the backlight device in which the defect has occurred. The backlight device that is placed over the existing backlight device must be removed.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a lighting unit, a lighting device, and a liquid crystal display device that can obtain thin and uniform light emission and have improved reworkability. It is in.
  • the illumination unit of the present invention is a lighting unit used as a backlight of a transmissive display panel.
  • the first and second light guides having a light emitting surface, and the back side of the light emitting surface
  • Each light guide has a light emitting part with one surface forming the light emitting surface, one end connected to the light emitting part, and the other end connected to the first and second light sources, respectively.
  • the first and second light guides forming the light incident surface from the two light sources, and the light emitting surface is divided into first and second regions and between the first and second light guides.
  • the reflection portion is formed so as to protrude from the light emitting surface when viewed in plan. Therefore, this surface light source device has a problem that the above-described rework (restoration) process takes time.
  • the light emitting surface is divided into first and second regions and has a reflecting surface formed in the light emitting portion so as to be interposed between the first and second light guide portions
  • the first and second light guides are provided on the back side of the first and second regions of the light emitting surface, respectively, and reflect the light on the reflecting surface toward the first and second regions, respectively. It is formed so as to guide the light.
  • the light guides, the light sources, and the reflective surfaces are arranged with little or no protrusion from the light emitting surface, and the light guide directions (from the first and second light sources) in each light guide. A distance in the traveling direction of the emitted light) can be secured.
  • the light guides of the illumination units arranged adjacent to each other can be arranged without overlapping. That is, it is possible to avoid interference between light guides arranged adjacent to each other during rework.
  • the reflecting surface is arranged perpendicular to the light emitting surface.
  • the reflecting surface is formed by a reflecting member provided in the light emitting section.
  • the reflective surface of the first light guide and the reflective surface of the second light guide are formed.
  • the light guide has a symmetrical shape with respect to the reflecting surface.
  • the first light guide and the second light guide can be manufactured in the same manufacturing process. That is, the illumination unit can be configured by bonding the first light guide and the second light guide having the same shape. For this reason, it is not necessary to provide another manufacturing process in order to manufacture the first light guide and the second light guide.
  • each of the light guides is arranged such that each light guide direction is inclined with respect to the light emitting surface.
  • the light guide unit can uniformly emit light from the light source to the reflection unit. For this reason, the reflected light from the reflection part is uniformly emitted to the light emitting surface. Thereby, more uniform surface emission can be obtained from the light emitting surface.
  • each of the light guides is arranged so that each light guide direction is parallel to the light emitting surface.
  • the thickness of the light guide can be further reduced. Therefore, the lighting unit can be thinned.
  • the light guide unit includes a light guide direction changing unit that changes each light guide direction at a contact portion with the light emitting unit.
  • the light emitted from the light source is changed in the light guide direction by the light guide direction changing unit, and is incident on the reflecting unit. For this reason, the reflected light from the reflection part is uniformly emitted to the light emitting surface. Thereby, more uniform surface emission can be obtained from the light emitting surface. Thereby, the illumination unit which implement
  • a plurality of light diffusing means for diffusing light is disposed on the light emitting surface or a surface facing the light emitting surface of the light emitting unit, and the light diffusing means is disposed on the light emitting surface. It is preferable that the distribution density is different depending on the amount of light emission.
  • the facing surface facing the light emitting surface of the light emitting section includes first and second facing surfaces facing the first and second regions, and the first facing.
  • the surface is formed to be inclined so that the distance from the light emitting surface is reduced as the distance from the second light source is increased, and the second facing surface is emitted from the light source as the distance from the first light source is increased. It is preferable that it is formed so as to be inclined so that the distance from the surface is small.
  • the light emitted from the first light source is reflected by the reflecting surface and further reflected by the first facing surface.
  • the light emitted from the second light source is reflected by the reflecting surface and further reflected by the second facing surface.
  • the opposing surface can more uniformly reflect the reflected light incident from the reflecting portion to the light emitting surface. Therefore, it is possible to provide an illumination unit that performs more uniform surface light emission.
  • a direction (light guide direction) from each light source to the light emitting unit of each light guide unit is a length direction, and a direction intersecting the length direction is a width direction.
  • each light source is a single point light source provided at the center in the width direction of each light guide, and the length of each light guide in the width direction is L1, and the refractive index of each light guide
  • n is the distance X in the length direction of each light guide part existing between each light source and the light emitting part
  • the lower limit value of the distance X is the light incident from the light source to the light guide unit at a critical angle on both sides in the width direction of the light guide unit at the boundary surface between the light emitting unit and the light guide unit.
  • the distance is set so as to extend to the end of the. Therefore, the light incident at a critical angle from the light source to the light guide unit can be spread over the entire boundary surface between the light emitting unit and the light guide unit.
  • the magnitude of the critical angle is determined by the refractive index of the light guide.
  • each light source Is composed of a point light source group in which a plurality of types of point light sources having different emission colors are arranged side by side along the width direction, and the distance between the point light sources arranged at both ends in the arrangement direction is L2,
  • the length in the width direction of each light guide part is L1 and the refractive index of each light guide part is n
  • each light source is provided at the center of the length L1 in each light guide part.
  • the distance X in the length direction of each light guide part existing between each light source and the light emitting part is:
  • the lower limit of the distance X is The distance is set so as to reach the end of the light guide. Therefore, with respect to all of the plurality of light sources, light incident at a critical angle from the light source to the light guide can be spread over the entire boundary surface between the light emitting unit and the light guide unit.
  • the critical angle is determined by the refractive index of the light guide.
  • the some light source is comprised by the light emitting diode of different colors, such as red (R), green (G), blue (B), for example, the light of each color is It is possible to avoid reaching the light emitting part before being mixed uniformly, and light of each color can be evenly mixed over the entire boundary surface between the light emitting part and the light guide part.
  • the light source includes a plurality of types having different emission colors, more uniform light can be emitted on the light emitting surface of the light guide.
  • the lighting units are arranged in a plurality of planes.
  • the illumination units are arranged in a plurality of planes, and the illumination units are arranged in a row so as to abut each other with the smallest distance. It is preferable that a space is formed between each of the lighting units below the butted portion.
  • an IC having a height such as a module or a driver, wiring, or the like can be arranged in the space.
  • a height such as a module or a driver, wiring, or the like
  • a plurality of rows of the respective lighting units are arranged so that the spaces communicate with each other.
  • heat generated by the lighting device can be convected through the communicating space. Therefore, for example, when the illumination device is used as a backlight in a liquid crystal display device, heat generated inside the liquid crystal display device can be convected in the space and radiated to the outside of the liquid crystal display device. Therefore, it is possible to configure an illumination device that can efficiently dissipate heat generated inside the device to the outside.
  • the illuminating device which can convect heat more efficiently can be provided.
  • the illumination device is provided as a backlight.
  • the illumination unit includes the first and second light guides having the light emitting surface, and the first and second light sources provided on the back side of the light emitting surface,
  • Each of the light guides has a light-emitting portion whose one surface forms the light-emitting surface, and first and second light-emitting portions having one end connected to the light-emitting portion and the other ends forming light incident surfaces from the first and second light sources, respectively.
  • a reflecting surface formed in the light emitting part so as to be divided between the first and second light guiding parts.
  • the first and second light guides are provided on the back sides of the first and second regions of the light emitting surface, respectively, and reflect the light on the reflecting surface, respectively. It is formed so as to guide the light toward the region 2.
  • the thin and uniform light emission can be obtained and the reworkability can be improved.
  • FIG. 1 It is a perspective view showing the structure of the light emission unit which comprises the backlight of FIG. It is the schematic showing the structure of a liquid crystal display device provided with the backlight which concerns on embodiment of this invention. It is a top view of the light guide part of FIG. (A) is a top view at the time of providing a light-diffusion means in the light emission unit of FIG. 1, (b) is a side view of (a). It is a side view showing the modification of the light emission unit of FIG. It is the schematic showing the structure of the conventional sidelight type illuminating device. It is the schematic showing the backlight structure connected by the conventional continuous coupling system.
  • FIGS. 1 to 5 An embodiment of the present invention will be described with reference to FIGS. 1 to 5 as follows.
  • FIG. 2 is a schematic diagram illustrating a configuration of a liquid crystal display device including the backlight according to the present embodiment.
  • the liquid crystal display device 1 of the present embodiment includes a liquid crystal display panel 3 (transmission type display panel), a backlight 2 (illumination device) disposed on the back of the liquid crystal display panel 3, and a liquid crystal An optical sheet 8 disposed between the display panel 3 and the backlight 2 is provided.
  • a liquid crystal display panel 3 transmission type display panel
  • a backlight 2 illumination device
  • a liquid crystal An optical sheet 8 disposed between the display panel 3 and the backlight 2 is provided.
  • the backlight 2 irradiates light toward the liquid crystal display panel 3 through the optical sheet 8.
  • the liquid crystal display device 1 is a transmissive liquid crystal display device that transmits light from the backlight 2 and performs display.
  • the configuration of the liquid crystal display panel 3 is not particularly limited, and a known liquid crystal panel can be appropriately applied.
  • the liquid crystal display panel 3 includes, for example, an active matrix substrate on which a plurality of TFTs (thin film transistors) are formed, and a color filter substrate facing the active matrix substrate, and a liquid crystal layer is sealed between these substrates. It has the structure enclosed with the material.
  • the backlight 2 is disposed behind the liquid crystal display panel 3 (on the side opposite to the display surface), and is configured by combining a light source 5a and a light guide 7a.
  • a plurality of light-emitting units 11 (illumination units) that are configured by combining the light-emitting unit 11a, the light source 5b, and the light guide 7b, and the light-emitting unit 11b having the reflective surface 18b bonded to each other by the reflective member 16. is doing.
  • These light emitting units 11 are arranged on a substrate for a liquid crystal display device.
  • FIG. 1 is a perspective view showing a configuration of a light emitting unit 11 according to the present embodiment.
  • a light emitting unit 11a and a light emitting unit 11b are arranged with a reflecting member 16 interposed therebetween.
  • the light emitting unit 11a includes a light source 5a, a reflective surface (reflecting portion) 18a that reflects light from the light source 5a, and a light guide 7a (first light guide) that diffuses light from the light source 5a and the reflective surface 18a to emit light.
  • Body a substrate 4a on which a light source 5a is disposed, a reflection sheet 6a, and the like.
  • the light emitting unit 11b includes a light source 5b, a reflecting surface (reflecting portion) 18b that reflects light from the light source 5b, and a light guide 7b (second light guide) that diffuses light from the light source 5b and the reflecting surface 18b to emit light.
  • Body a substrate 4b on which a light source 5b is arranged, a reflection sheet 6b, and the like.
  • the light emitting unit 11 includes a light guide 7a having a light emitting surface 12a (first region) that emits surface emitting light, a light guide 7b having a light emitting surface 12b (second region), and a back side of the light emitting surface 12a. And a light source 5b (second light source) provided on the back side of the light emitting surface 12b.
  • the light guides 7a and 7b have light-emitting portions 10a and 10b each having a light-emitting surface 12a and 12b, one end connected to the light-emitting portions 10a and 10b, and the other end forming an incident surface for light from the light sources 5a and 5b.
  • the light guides 9a and 9b and the light emitting surfaces 12a and 12b are divided into a light emitting surface 12a (first region) and a light emitting surface 12b (second region), and interposed between the light guides 9a and 9b.
  • the light emitting units 10a and 10b have reflection surfaces 18a and 18b formed in the light emitting units 10a and 10b.
  • the light emitting surface 12a is a surface emitting light from the light source 5a
  • the light emitting surface 12b is a surface emitting light from the light source 5b.
  • the light guide 9a is provided on the back side of the light emitting surface 12a, and the light guide 9b is provided on the back side of the light emitting surface 12b.
  • the light guide part 9a is formed so that light may be guided toward the light emission surface 12a by reflecting light in the reflective surface 18a, and the light guide direction of the light guide part 9a is with respect to the light emission surface 12a. It is arranged to be inclined.
  • the upper surface of the light guide portion 9a (the surface on which the light emitting surface 12a is disposed) is connected to the facing surface 13a (first facing surface) of the light emitting surface 12a.
  • the facing surface 13a is inclined such that the distance to the light emitting surface 12a increases from one side in contact with the light emitting surface 12a toward the center (side connected to the upper surface of the light guide portion 9a). Is formed.
  • the facing surface 13a is formed so as to be inclined so that the distance from the light emitting surface 12a decreases as the distance from the light source 5b increases.
  • the light guide 9b is formed so as to guide light toward the light emitting surface 12b by reflecting the light on the reflecting surface 18b, and the light guide direction of the light guide 9b is relative to the light emitting surface 12b. It is arranged to be inclined.
  • the upper surface of the light guide portion 9b (the surface on which the light emitting surface 12b is disposed) is connected to the facing surface 13b (second facing surface) of the light emitting surface 12b. Then, the facing surface 13b is inclined such that the distance to the light emitting surface 12b increases from one side in contact with the light emitting surface 12b toward the center (side connected to the upper surface of the light guide portion 9b). Is formed.
  • the facing surface 13b is formed so as to be inclined so that the distance from the light emitting surface 12b decreases as the distance from the light source 5a increases.
  • the light guides 9a and 9b, the light sources 5a and 5b, and the reflection surfaces 18a and 18b are arranged with little or no protrusion from the light emitting surfaces 12a and 12b when viewed in plan, and the light guides 9a and 9b are arranged.
  • the distance in the light guide direction in 9b can be secured.
  • the light guides of the light emitting units 11 arranged adjacent to each other can be arranged without overlapping. That is, it is possible to avoid interference between light guides arranged adjacent to each other.
  • the rework process can be performed more efficiently as compared with the conventional tandem type illumination device in which the adjacent light guides are arranged to overlap each other.
  • the light emitting unit 11 of the present embodiment it is possible to configure a backlight capable of efficiently performing the rework process while obtaining the same effect as the conventional tandem structure. That is, according to the light emitting unit 11, it is possible to configure the backlight 2 that is thin and uniform and that has improved reworkability.
  • the light guides 7a and 7b are mounted on the substrate by fixing members 14 made of, for example, screws or pins, at two locations near the end portions of the light guide portions 9a and 9b on the side where the light sources 5a and 5b are disposed. 4a and 4b and a substrate for driving a liquid crystal display device (not shown) formed below the substrates 4a and 4b.
  • the light (light flux) emitted from the light sources 5a and 5b which are point light sources, spreads radially with a critical angle ⁇ in the light guide portion 9a9b (details will be described later). Accordingly, as shown in FIG. 1, the light guides 9a and 9b are fixed to two ends of the light guides 9a and 9b on the side where the light sources 5a and 5b are arranged, and the light guides 9a and 9b in the width direction. Even if the member 14 is provided, the light emitted from the light emitting surface 12 is not affected.
  • the light sources 5a and 5b are point light sources such as light emitting diodes (LEDs).
  • the light sources 5a and 5b are composed of a plurality of types of light emitting diodes having different emission colors.
  • the light sources 5a and 5b are configured by an LED group in which a plurality of light emitting diodes of three colors of red (R), green (G), and blue (B) are arranged. By combining the light emitting diodes of these three colors to form a light source, white light can be irradiated on the light emitting surface.
  • the color combination of the light emitting diodes can be appropriately determined based on the color development characteristics of the LEDs of each color and the color development characteristics of the backlight desired according to the purpose of use of the liquid crystal display device 1.
  • the light sources 5a and 5b composed of the LED groups are mounted on the substrates 4a and 4b.
  • As the light sources 5a and 5b side light emitting type LEDs in which LED chips of respective colors are molded in one package may be used. As a result, a backlight having a wide color reproduction range can be obtained.
  • the light sources 5a and 5b may be configured by one white light emitting diode, thereby irradiating white light.
  • the light sources 5a and 5b are disposed at the end portions of the light guide portions 9a and 9b farthest from the reflecting surfaces 18a and 18b.
  • the light source 5a is disposed at the end portion of the light guide portion 9a, and the light source 5b is disposed at the light guide portion 9b. It is arranged at the end.
  • the surface (light emitting surfaces 12a and 12b) of the light emitting portions 10a and 10b of the light guides 7a and 7b or the opposing surfaces 13a and 13b are processed and processed to emit the light guided to the front.
  • light can be emitted more efficiently from the light emitting surfaces 12a and 12b to the liquid crystal display panel 3 side.
  • Examples of processing and processing applied to the surfaces (light emitting surfaces 12a and 12b) of the light emitting portions 10a and 10b of the light guides 7a and 7b include prism processing, embossing processing, and printing processing. It is not limited, The well-known output processing is given suitably.
  • the light guides 7a and 7b may be formed of a transparent resin such as polycarbonate (PC) or polymethyl methacrylate (PMMA), but are not limited thereto, and are materials generally used as a light guide. Can be formed.
  • the light guides 7a and 7b can be formed using a mold such as injection molding, extrusion molding, or hot press molding. However, it is not limited to these methods, and any method may be used as long as it is a processing method that exhibits the same characteristics.
  • the reflection member 16 is for forming the reflection surfaces 18a and 18b that optically connect the light emitting portions 10a and 10b of the light guides 7a and 7b and the light guide portions 9a and 9b.
  • the reflective surfaces 18a and 18b are arranged perpendicular to one end portions of the light emitting surfaces 12a and 12b. For this reason, the contact area of the light guide part 9a and the light guide part 9b can be ensured widely, and the strength of the contact between the light guide body 9a and the light guide body 9b can be improved.
  • the reflecting member 16 is formed between the bonding surfaces (reflecting surfaces 18a and 18b) of the light guides 7a and 7b arranged to face each other, and by performing mirror processing on the respective bonding surfaces. Is formed.
  • Examples of the material of the reflecting member 16 include silver having a high reflectance. However, the material of the reflecting member 16 is not limited to silver, and any material can be used as long as a necessary reflectance can be obtained.
  • the reflecting member 16 is formed by, for example, forming the light guides 7a and 7b with a transparent resin using a mold, and depositing silver on the bonding surfaces (reflecting surfaces 18a and 18b) of the light guides 7a and 7b, respectively.
  • the formed silver is bonded to the reflective surfaces 18a and 18b by an adhesive.
  • a reflective sheet is stuck on the bonding surfaces (reflective surfaces 18a and 18b) of the light guides 7a and 7b, respectively, and the pasted reflective sheets are bonded to each other with an adhesive, whereby the reflective member 16 is attached to the reflective surfaces 18a and 18b. It may be formed.
  • the method for forming the reflecting member 16 and the method for adhering the light guides 7a and 7b are not limited to the methods described above, and any method may be used as long as it is a processing method that exhibits the same characteristics.
  • the light guide 7a and the light guide 7b can be coupled by forming the reflection member 16 between the reflection surfaces 18a and 18b which have a planar shape and are arranged to face each other.
  • the light emitted from the light sources 5a and 5b is reflected inside the light guides 9a and 9b, is further reflected by the reflecting surfaces 18a and 18b, and enters the light emitting unit 10.
  • the light incident on the light emitting units 10 a and 10 b is surface-emitted from the light emitting surface 12.
  • the light emitted from the light sources 5a and 5b is indirectly emitted to the light emitting surface 12. That is, the light emitted from the light sources 5a and 5b is not directly emitted to the light emitting surfaces 12a and 12b. Thereby, uniform surface light emission can be obtained by the light emitting surfaces 12a and 12b.
  • the upper surfaces of the light guides 9a and 9b (the surface on the side where the light emitting surface 12 is disposed) and the lower surface facing the upper surface are arranged parallel or open in the light emitting direction. Thereby, the light from the light sources 5a and 5b can be totally reflected and guided to the light emitting units 10a and 10b.
  • the substrate 4a is for arranging the light source 5a
  • the substrate 4b is for arranging the light source 5b.
  • the substrates 4a and 4b are preferably white in order to improve luminance.
  • substrate 4a * 4b in order to carry out lighting control of each LED which comprises light source 5a * 5b Driver is implemented.
  • the reflection sheets 6a and 6b are provided in contact with the opposing surfaces 13a and 13b.
  • the reflection sheets 6 a and 6 b reflect light and efficiently emit light from the light emitting surface 12.
  • light that is not incident on the light guides 9a and 9b out of the light emitted from the light sources 5a and 5b is directly emitted from the opposing surfaces 13a and 13b. It can prevent entering into 10a * 10b. That is, by providing the reflective sheets 6a and 6b on the opposing surfaces 13a and 13b, it is possible to shield light incident on the inside of the light emitting units 10a and 10b from the outside of the opposing surfaces 13a and 13b.
  • the backlight 2 according to the present embodiment is configured by arranging a plurality of light emitting units 11 having the above-described configuration, for example, in a matrix. That is, the illumination area of the backlight 2 is divided into areas by the light emitting units 11a and the light emitting units 11b.
  • the optical sheet 8 is disposed on the top of the structure in which the plurality of light emitting units 11 are disposed.
  • the optical sheet 8 includes a diffusion plate for irradiating the liquid crystal display panel 3 with uniform light, a diffusion sheet for condensing light while condensing light, a lens sheet for condensing light and improving luminance in the front direction, and light.
  • the polarization reflection sheet that reflects one of the polarization components and transmits the other polarization component to improve the luminance of the liquid crystal display device 1, or the like, or a combination of these appropriately.
  • the configuration of the optical sheet 8 may be determined according to the price and performance of the liquid crystal display device 1.
  • the light emitted from the point light sources 5a and 5b travels in the light guide 7 while receiving the scattering action and the reflection action, and is emitted from the light emitting surfaces 12a and 12b. 1 and 2, the traveling direction of light is indicated by arrows.
  • the light emitted from the light emitting surfaces 12a and 12b is made uniform by being diffused and condensed by the optical sheet 8 disposed on the front surfaces of the light guides 7a and 7b, and the liquid crystal display panel 3 Will be irradiated.
  • each of the plurality of light emitting units 11a and 11b can independently control the luminance.
  • Area active control of the illumination area of the backlight 2 can be performed by individually controlling the brightness of each of the plurality of light emitting units 11a and 11b. For this reason, according to the liquid crystal display device 1, a high-contrast image can be displayed.
  • the light sources 5a and 5b are configured by LED groups in which a plurality of light emitting diodes of three colors of red (R), green (G), and blue (B) are arranged side by side.
  • the light guides 9a and 9b also serve as a color mixture area for mixing the colors of each color and emitting white light on the light emitting surface 12.
  • the light guide portion color mixing area
  • the light of each color is not completely mixed, and the light separated into each color is emitted from the light emitting surfaces 12a and 12b of the light emitting portions 10a and 10b. From the light source, which causes uneven brightness.
  • the length of the light guide will be described with reference to FIG.
  • the light guide unit 9a will be described, but the same applies to the light guide unit 9b.
  • FIG. 3 is a plan view of the light guide portion 9a.
  • the light source 5a includes a green LED (G-LED), a red LED (R-LED), a blue LED (B-LED), and a green LED (G-LED). It is assumed that one LED group is provided in the light guide portion 9a.
  • the light beam emitted from the light source 5a is generated in the light guide 9a. It spreads radially with a critical angle ⁇ .
  • This critical angle ⁇ is determined by the refractive index n of the material forming the light guide. That is, the light guide portion 9a plays a role of sufficiently spreading the light beam that has entered the light guide body 7 at the critical angle ⁇ before reaching the light emitting portion 10a.
  • the refractive index of the light guide 7a is n.
  • the light incident on the light guide 7a from the air layer outside the light guide provided with the light source 5a falls within the critical angle ⁇ according to Snell's law.
  • the light incident on the light guide 7a from the light source 5a is incident on the light guide 7a from the light source 5a at a critical angle ⁇ in order to reach the entire boundary surface between the light emitting unit 10a and the light guide 9a.
  • the light only needs to reach the ends on both sides in the width direction D2 of the light guide 7a within the light guide 9a.
  • the lower limit value of the distance X for satisfying such a condition is that light from an LED arranged at a position farthest from one end of the light guide 7a among a plurality of LEDs constituting the light source 5a.
  • the distance is such that it reaches the end of the light guide 7a when entering the light guide at a critical angle. That is, in FIG. 3, the light that has entered the light guide 7a at the critical angle ⁇ from the leftmost LED (that is, the G-LED), as indicated by the broken line,
  • the distance in the case of reaching the end of the light guide 7a on the boundary surface may be the lower limit of the distance X.
  • the lower limit of X is a value that satisfies the following (formula d).
  • the distance X satisfies the following (Formula 1).
  • the light source 5a when satisfy
  • the length X of the light guide part 9a can be set short. It becomes possible.
  • the backlight 2 configured by combining the light emitting unit 11 formed by bonding the light emitting units 11a and 11b as described above with the reflecting member 16, all of the plurality of light sources are incident on the light guide from the light source at a critical angle.
  • the spread light can be spread over the entire boundary surface between the light emitting unit and the light guide unit.
  • the plurality of light sources are composed of light emitting diodes of different colors, it is possible to avoid the light of each color from reaching the light emitting part before being uniformly mixed, the light emitting part and the light guiding part
  • the light of each color can be mixed evenly on the entire boundary surface.
  • a space area A is formed in the vicinity of the area where the light emitting units 11 adjacent to each other are in contact.
  • the backlight 2 has a plurality of light emitting units 11 arranged in a plane, and each light emitting unit 11 abuts the portions where the distances between the light emitting surfaces 12a and 12b and the opposing surfaces 13a and 13b are minimized. Are arranged in rows. A space region A (space) is formed between the light emitting units 11 below the abutted portion.
  • the space area A is an area formed by being surrounded by the facing surface 13a and the light guide portion 9a of the light emitting portion 10a of the light emitting unit 11a and the facing surface 13b and the light guide portion 9b of the light emitting portion 10b of the adjacent light emitting unit 11b. It is.
  • a driver for driving the liquid crystal display device 1, an IC chip having a height such as a module, wiring, and the like can be arranged.
  • a thermistor for temperature measurement, a photosensor for measuring deterioration of the LED, an LED driving driver capable of lighting a plurality of light sources 5a and 5b made of LEDs, and the like can be given.
  • the space region A in which a driver, a module, an IC chip having a height, a wiring, and the like can be newly arranged is formed. It becomes possible to improve the degree of freedom of circuit design.
  • the plurality of light emitting units 11 are arranged so that the space area A penetrates the liquid crystal display device 1 above and below. Thereby, the heat generated from the circuit of the liquid crystal display device 1 can be convected in the space region A and radiated to the outside. According to the configuration of the backlight 2 of the present embodiment, heat generated from the circuit of the liquid crystal display device 1 can be efficiently radiated to the outside.
  • a heat radiation related member such as a heat pipe is arranged in the space area A.
  • the heat generated from the circuit of the liquid crystal display device 1 can be radiated to the outside more efficiently.
  • the prism 15 for diffusing light on the surfaces of the light emitting surfaces 12a and 12b (the surface on the side where the liquid crystal panel 3 is disposed) or the opposing surfaces 13a and 13b.
  • a plurality of means may be arranged.
  • FIG. 4 (a) is a plan view showing the configuration of the light emitting unit according to the present embodiment
  • FIG. 4 (b) is a side view of FIG. 4 (a).
  • the light emitting unit 21 includes a light emitting unit 21a in which a plurality of prisms are arranged as light diffusing means on the light emitting surfaces 12a and 12b, and a light emitting unit 21b. It is a laminated structure. Other configurations of the light emitting units 21a and 21b are the same as those of the light emitting units 11a and 11b.
  • the distribution density of the prisms 15 is arranged so as to be from the near side to the far side of the reflecting surfaces 18a and 18b (sparse ⁇ dense). .
  • the prism 15 is arranged so that the distribution density is dense in the region where the amount of light emitted from the light emitting surface 12 is small, and the prism 15 is arranged so that the distribution density is sparse in the region where the amount of light is large. Deploy.
  • the plurality of prisms 15 are arranged on the light emitting surface 12 so that the in-plane distribution of the amount of light emitted from the light emitting surface 12 is uniform.
  • the distribution density of the prisms 15 is set based on the light emission amounts of the light emitting surfaces 12a and 12b of the light guides 7a and 7b, and the arrangement configuration is not particularly limited.
  • the prism 15 as the light diffusion means on the light emitting surfaces 12a and 12b, the luminance uniformity of the backlight 2 can be further improved.
  • the light diffusing means is not limited to a prism, and for example, fine unevenness (such as a textured shape) or a printed dot pattern, which has been conventionally used as a light diffusing member for an illumination device. Can be used.
  • FIG. 5 is a side view showing a modification of the light emitting unit according to the present embodiment.
  • the light emitting unit 31 includes a light emitting unit 31a and a light emitting unit 31b that are bonded to each other with a reflecting member 16.
  • the light emitting units 31a and 31b are different from the light emitting units 11a and 11b in that the contact angles between the light emitting unit and the light guide unit are different.
  • the light guide 37a includes a light emitting unit 10a (light emitting unit) having a light emitting surface 12a, a light guiding unit 39a (light guiding unit) that guides light from the light source 5a to the light emitting unit 10a, and a light guide.
  • a reflection surface 18a (light guide direction changing unit) that reflects light from the light unit 39a to the light emitting unit 10a.
  • the light guide 37b includes a light emitting unit 10b (light emitting unit) having a light emitting surface 12b, a light guiding unit 39b (light guiding unit) that guides light from the light source 5b to the light emitting unit 10b, and a light guiding unit 39b.
  • a reflection surface 18b (light guide direction changing unit) that reflects light to the light emitting unit 10b.
  • the light guide 39a includes connection areas 38a and 38b.
  • the light guides 39a and 39b are arranged so that the light guide direction is parallel to the light emitting surfaces 12a and 12b.
  • a connection area 38a is provided at the boundary between the light guide 39a and the reflective surface 18a, and a connection area 38b is provided at the boundary between the light guide 39b and the reflective surface 18b.
  • the bottom surfaces of the connection area 38a and the connection area 38a are arranged such that the end portions in contact with the reflecting surfaces 18a and 18b are inclined toward the light emitting surface 12 side from the other end portions.
  • the light emitting unit 31 can be made thinner than the light emitting unit 11 by arranging the light guiding directions of the light guiding portions 39a and 39b parallel to the light emitting surfaces 12a and 12b. Thereby, the thickness of the backlight 2 can be made thin and the liquid crystal display device 1 can be made thin.
  • the illumination device of the present invention can be used as a backlight of a liquid crystal display device.
  • Liquid crystal display device 2 Backlight (lighting device) 3 Liquid crystal display panel (transmission type display panel) 4a and 4b Substrate 5a Light source (first light source) 5b Light source (second light source) 6a, 6b Reflective sheet 7a Light guide (first light guide) 7b Light guide (second light guide) 8 Optical sheet 9a Light guide part (first light guide part) 9b Light guide part (second light guide part) 10a and 10b Light emitting section 11 Light emitting unit (lighting unit) 11a / 11b Light emitting unit 12a Light emitting surface (first region) 12b Light emitting surface (second region) 13a Opposing surface (first opposing surface) 13b facing surface (second facing surface) 14 Fixing member 15 Prism (light diffusion means) 21 Light Emitting Unit (Lighting Unit) 31 Light emitting unit (lighting unit) 37a Light guide (first light guide) 37b Light guide (second light guide) 38a / 38b Connection area (light guide direction changing part) 39a Light guide (first light guide)

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

L'invention concerne une unité émettrice de lumière (11) qui comprend: des corps de guidage de lumière (7a, 7b) comportant des surfaces émettrices de lumière (12a ; 12b) ; et des sources de lumière (5a, 5b) situées sur les côtés arrière des surfaces émettrices de lumière (12a ; 12b). Les corps de guidage de lumière (7a, 7b) comportent des parties émettrices de lumière (10a, 10b) dont des premières surfaces constituent les surfaces émettrices de lumière (12a ; 12b), des parties de guidage de lumière (9a, 9b) dont des premières extrémités sont connectées aux parties émettrices de lumière (10a, 10b) tandis que les autres extrémités constituent des plans d'incidence respectifs de la lumière provenant des sources de lumière (5a, 5b), et des surfaces de réflexion (18a, 18b) formées dans les parties émettrices de lumière (10a, 10b) de manière à séparer la surface émettrice de lumière (12a) de la surface émettrice de lumière (12b) et à s'interposer entre la partie de guidage de lumière (9a) et la partie de guidage de lumière (9b). Les parties de guidage de lumière (9a, 9b) sont disposées sur les côtés arrière des surfaces émettrices de lumière (12a ; 12b), et sont conçues de manière à guider la lumière vers les surfaces émettrices de lumière (12a ; 12b) respectives en réfléchissant la lumière sur les surfaces de réflexion (18a, 18b), ce qui permet d'obtenir une émission uniforme et de type fin, et d'améliorer l'aptitude au re-façonnage.
PCT/JP2009/057266 2008-07-22 2009-04-09 Unité d’éclairage, dispositif d’éclairage et dispositif d’affichage à cristaux liquides Ceased WO2010010742A1 (fr)

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JP2008-188958 2008-07-22

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